Marine Weather and Tides
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen
|Sunrise 7:23AM||Sunset 5:20PM||Saturday December 7, 2019 6:03 AM EST (11:03 UTC)||Moonrise 2:51PM||Moonset 2:49AM||Illumination 80%|
7 Day Forecast for Marine Location Near Walhalla, SCHourly EDIT Help
Area Discussion for - Greenville-Spartanburg, SC  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS62 KGSP 070856 AFDGSP
Area Forecast Discussion National Weather Service Greenville-Spartanburg SC 356 AM EST Sat Dec 7 2019
SYNOPSIS. Dry high pressure returns for the weekend, but an unsettled weather pattern will develop by early Monday as a cold front approaches. Rain is likely Tuesday, possibly changing to snow in the North Carolina mountains early Wednesday. Dry and cold high pressure will return behind the front.
NEAR TERM /THROUGH TONIGHT/. As of 310 am: Other than weak NW flow/upslope stratocu across the northern NC mtns and lower French Broad Valley, skies have cleared across all but the Upper Savannah River Valley and Lakelands areas this morning. Surface gradient is expected to remain relaxed and dry air advection minimal until it begins responding to surface high/associated ridge spilling east of the central Appalachians later today. Thus, there is some potential for patchy fog to develop across the area by daybreak, especially across the valleys of southwest NC, and other fog-prone locations in the CWA.
Aforementioned surface ridge will result in gradual arrangement of the pressure pattern into a cold air damming configuration throughout the day, with strengthening NE flow and advection of drier/somewhat cooler air into the forecast area. Moisture will be limited to a thin layer near the inversion level, so typical CAD conditions with widespread low cloud cover are not expected, although clouds may develop/linger near the Blue Ridge during the afternoon and evening. Nevertheless, lower thickness values will likely yield afternoon max temps very close to yesterday's readings, or in the neighborhood of climatology. Tonight's min temps should also be near normal under generally mostly clear/partly cloudy skies and light winds.
SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/. As of 250 AM Sat: Cool sfc high pressure will continue to move off the East Coast on Sunday. Flow at the sfc will remain northeasterly; the offshore upper ridge will permit moderate return flow over the sfc airmass. Though gradual moistening will lead to increasing cloud cover thru the day, most model guidance depicts the moist layer as being too shallow for precip to develop until after sunset. Thus, despite the high being cold by nature and in position to foster in-situ CAD, the lack of precip and at least partial sunshine suggest temps will manage to break into the 50s over most of the Piedmont and in the western mtn valleys.
Precip should develop quickly overnight into early Monday. Temps will be fairly steady across the area, even warming slightly (especially at high elevations) as the WAA and moistening overcome the cold air to some degree. Though the best warm frontal lift will move off to the north on Monday, modest PoPs persist thru the day. CAD finally may develop, or at least a look-alike wedge event, and for that reason Monday max temps have been held toward the cooler end of guidance, especially between the Escarpment and I-85. Temps Monday night will remain warm and again nondiurnal with the wedge locked in. PoPs begin to increase again in the west early Tuesday, as the cold front approaches.
LONG TERM /TUESDAY THROUGH FRIDAY/. As of 315 AM Sat: Rain becomes likely in essentially all areas Tuesday with a cold front, driven east by a large Arctic high. Brief heavy rain could occur with the front on Tuesday, though even the wettest models and the speed of the fropa indicate a relatively low hydrologic threat. Only tiny SBCAPE is shown preceding the front into our Piedmont zones, so the strong shear appears unlikely to be realized. The incoming Arctic air will quickly bring temps below freezing Tuesday evening across the mountains, and light precip likely still will be ongoing as that occurs. Accumulating snow is expected across the cooler areas of the mtns, with the most significant totals in the northwest flow areas. The likelihood of eventually needing a Winter Weather Advisory has increased, based on the current progs.
Dry and cold conditions will return in the wake of the front, with temps a few degrees below climo on Wednesday and even colder Thu and Fri. Our next opportunity for precip likely will result from a shortwave inducing cyclogenesis near the Gulf Coast near the end of the week. The details remain murky, with model solutions reflecting an uncomfortable amount of spread in both timing and location of said cyclogenesis. Those solutions that do depict the low affecting our area generally do so after the Arctic high has set up over the East Coast, implying some possibility of wintry precip at least at the onset of the event. Most likely this would occur on Friday but some ensemble members bring it in late Thursday; just to underscore the low predictability of the event, the Canadian GDPS actually doesn't show any system at all. Until the guidance comes into better agreement, all we can say is that Thursday thru Saturday remains a period to be watched.
AVIATION /09Z SATURDAY THROUGH WEDNESDAY/. At KCLT and elsewhere: Skies have begun to steadily clear from north to south across the terminal forecast area early this morning. Advection of drier low level air is expected to hold off until later today, while winds should remain light this morning. Thus, there are concerns that at least patchy fog could develop by daybreak, especially in the particularly fog-prone areas. For the time being, restrictions are limited to a tempo for 3SM/FEW003 at KHKY from 10-12Z, but certainly would not rule out other sites getting in on the act, esp KAVL. Trends will continue to be monitored closely through the morning for possible amendments. Otherwise, as the pressure patterns develops a more cold air damming-like configuration, winds are expected to pick out of the NE at 5-10 kts (generally remaining light/vrbl at KAVL) after sunrise. Weak upglide developing over the stable surface layer could result in increasing cloud cover this afternoon into the evening, esp near the high terrain, and MVFR cigs are in fact forecast to develop at KHKY and KAVL this evening.
Outlook: Brief improvement in any flight restrictions is possible during the day Sunday, but restrictions are likely to return late Sunday into early Monday with occasional rain developing until a cold front pushes through the area Tuesday. Dry high pressure should return by Wed.
Confidence Table .
09-15Z 15-21Z 21-03Z 03-06Z KCLT High 100% High 100% High 100% High 100% KGSP High 100% High 100% High 100% High 100% KAVL High 100% High 100% Med 70% Med 73% KHKY High 100% High 100% High 98% High 100% KGMU High 100% High 100% High 100% High 100% KAND High 100% High 100% High 100% High 100%
The percentage reflects the number of guidance members agreeing with the scheduled TAF issuance flight rule category. Complete hourly experimental aviation forecast consistency tables and ensemble forecasts are available at the following link:
GSP WATCHES/WARNINGS/ADVISORIES. GA . None. NC . None. SC . None.
SYNOPSIS . 08 NEAR TERM . JDL SHORT TERM . 08 LONG TERM . 08 AVIATION . JDL
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|CHDS1 - Strom Thurmond Dam, SC||89 mi||74 min||NNE 1 G 2.9||52°F|
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|Clemson, Clemson-Oconee County Airport, SC||12 mi||70 min||N 0||9.00 mi||Fair||42°F||41°F||96%||1023 hPa|
|Pickens County Airport, SC||20 mi||69 min||N 0||10.00 mi||Fair||35°F||34°F||100%||1022.3 hPa|
Link to 5 minute data for KCEU
Wind History from CEU (wind in knots)
|1 day ago||SW||W||W||W||W||N||E||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||NW||NW||Calm||Calm||Calm|
|2 days ago||W||W||W||W||W||W||SW||W|
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GEOS Local Image of EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Greenville-Spartanburg, SC (6,6,7,8)(on/off)  Help
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